Rotary tool for cleaning, chipping, or scaling surfaces



April 26' .1927 'w. B. wzGHT ROTARY TOOL FOR' GLEANING, CHIPPING, OR SGALIHG SURFACES z sheets-sheet 1 Filed 0G12. 9, 1924 April 26, 1927. t W. B. WRIGHT ROTARY TOOL FOR CLEANING, CHIPPING, 0R SCALING SURFACES Filed oct. 9, 1924 zsheets-Sheet 2 Patented Apr. 26, i 1927.

- star WILLIAM BRUCEIWRIGHTyoF cusroivi krHouse, LONDON, ENGLAND.

SRQTARY Afrom: "ron CLEANING, CHIPPING, 503e soAnING *SU-Renens.

Application'led October 9, 192111,-Se1ia1 No. 742,733, and in Great Britain November 29, 1923.

"This invention Vrelates to .rotary tools adapted for cleaning, chipping vor scaling surfaces such as the plates of boilers, `water and other tanks, ships decks, hulls and the ylilnyand has for its objectian improved construction capable of efficient action without'y in'iparting undue shock tothe hand of the person manipulatingthe Itool.

The ,improved tool forming the subject `matterof-this invention comprises a driving shaft and a plurality of hammers attached' thereto-injsu'ch manner as toproject-radially of the shaft at spaced intervals and be capable of universal pivotal movements. The

' movement of the hammers around the shaft is resisted by springs or other resilient means provided fo-r the purpose whilst other movement of the hammers in relation to the shaft is resisted by centrifugal action. y

` In one practical form of construction the driving shaft which is mounted to rotate in ball or other antfriction bearings carries two spaced bosses or projections supporting between them a rigid helix surrounding the shaft for one or more convolutions and the hammers are pivotally suspended from this helix and maintained at spaced intervals by interposed springs.

The invention is hereinafter more fully explained, reference being had to the accom# panying drawing in whichz f Fig. l is a longitudinal section of a pre'- ferred form of construction of my improved rotary tool, parts being omitted for the sake of clarity, and

Fig. 2 is an end elevation of the same.

Fig. 3 shows in front and side elevation one of the hammer members detach-ed.

Fig. 4 shows similar views of a modified hammer member and,

Fig. 5 is a front elevation of a further modified hammer device.

Referring to Figs. l and 2 it will be seen that the rotary tool comprises a shaft a mounted in ball bearings b vwhich are supported in a tubular member c serving as a handle by which the tool may be manipulated and a portion of the shaft projecting beyond the tubular member carries the pivotally suspended hammer devices.

Attached to this projecting portion of the shaft are two bosses Z and e formed with radially projecting arms d and e respectively. These arms which are prevented from turning in relation to ,the shaft a by pins f driven through the sleeves d and c and enga-ging `a flattened surfacel'on the shaft, support; between them rigid'fhelixxg surrounding the shaft in :thezexainple -illus- "60 convolutions. The sleeves 'cl and we :abut` trated to the extent 0f about'fonefand. half against a shoulder a on the shaft, a vand Lare held inV place `by fa' nutl o2` screwed on lthe free end of the shaft.

The hammer devices it indicated finFigsa2 i and 3 are slotted atv tfat one end 4'fori-enf gagement with the helixg andare #formed withan angularcuttingxedge h2 :att-heropposite end which is somewhat enlarged in order to accentuate the centrifugal action` thereon and so improve the striking effect of the hammers. These hammers L and helical compression springs c' are threaded upon the helix g alternately and the ends of the helix secured'to the radial arms d and e, so that all the hammers are pivotally engaged with the helix and held resiliently against deflection by means of the springs l j j A shield j secured by screws 7" to a flangey c at one end of the tubular member c partly encloses the operative head ofthe rotary lodged by the hammers flying inthe direction ofthe operator. The end of the shaft a remote from the hammers z may be coupled directly With a driving motor or be connect ed by means of a iexible shaft with some is enabled to act efficiently upon a larger surface thany a series of hammers arranged around a circle and the tendency to vibra` tion is reduced to a minimum.` j

The hammer devices illustrated in Figs. 2 and 3 are particularly adapted for operating upon large surfaces of a more or less plain character, but Where the surface to be treated is pitted and uneven the hammer .tool and serves to intercept fragments disdevices 7c shown in Fig. 4 are to be preferred.

These latter are formed with a disc shaped operative end and with an elongated eye k2 at the remote end for engagement with` the helix g. Y l, v

In cases Where a lighter action 'resembling brushing or scouring rather than chipping is desired, the toolvmay be fitted with lighter hammer devices such as that- Z shown in Fig.

5 comprising a length of thin metal rod or` axially otsaid shaft for rotation therewith,

a series of centrifugally acting hammer ele-- ments` loosely pivotally engaged lwith lsaid helix and springs interposed between the adjacent hammer elements. l

' 2. A rotary tool for cleaning surfaces comprising a driving shaft'rotating in bearings,

a handle member supporting said bearings, radial arms attached tosaid shaft, a rigid' helix secured to said armsand arranged coaxially of said shaft, centrifugally' acting, hammer elements loosely, pivotally engaged with said helix, springs interposed between the adjacent hammer elementsv vand springs between the hammer elements and the radial Y arms. t

, 8. A rotary tool for oleanmgsurfaces comprising a driving shaft rotating in bearings,`

a tubular handle member supporting said bearings and enclosing a portiolrof said shaft, a rigid helix secured to that `part of theshaft outside the handle and ,arranged coaxally with said shaft, centrifugally acting, hammer elements loosely-pivotally en-` gaged with the helix and a shield device secured to the tubular handle and partially' enclosing the helix and hammer elements. y In testimony whereof he has affixed lhis signature.

-WILLmM BRUCE wRIeHT. 

